Machine tool with plug-in connection

Abstract

A machine tool, in particular a rotary hammer or chisel hammer, comprising a housing with a grip area, an assembly comprising an impact mechanism and a drive unit, wherein the impact mechanism has an impact axis defining a longitudinal direction, wherein the assembly is arranged at least partially within the housing and is movably arranged relative to the housing at least in the longitudinal direction and in a vertical direction perpendicular to the longitudinal direction, and with at least one rear Z-decoupling spring, which is arranged between the assembly and the housing and which compresses when the assembly is moved in the longitudinal direction towards the grip area; wherein at least one plug connection with a plug axis extending in the longitudinal direction is provided between the assembly and the housing, wherein the plug connection disconnects when the assembly is moved in the longitudinal direction towards the grip area.

Description

[0001] The invention relates to a machine tool, in particular a rotary hammer or chisel hammer, according to the preamble of claim 1. Such a machine tool is equipped with a housing having a grip area, an assembly comprising an impact mechanism and a drive unit, wherein the impact mechanism has an impact axis defining a longitudinal direction, wherein the assembly is arranged at least partially within the housing and is movably arranged relative to the housing at least in the longitudinal direction and in a vertical direction perpendicular to the longitudinal direction, and with at least one rear Z-decoupling spring, which is arranged between the assembly and the housing, and which springs back when the assembly is moved in the longitudinal direction towards the grip area.

[0002] EP4331774 A1 describes a machine tool with a housing having a grip area and an assembly comprising a percussion device and a drive device, wherein the assembly is substantially arranged inside the housing and is movable relative to the housing.

[0003] The object of the invention is to provide a machine tool that is particularly low-maintenance and vibration-free for the user, with particularly low effort and particularly good usability.

[0004] The problem is solved according to the invention by a machine tool having the features of claim 1. Preferred embodiments are specified in the dependent claims.

[0005] A machine tool according to the invention is characterized in that at least one plug connection with a longitudinally extending plug axis is provided between the assembly and the housing, wherein the plug connection unplugs when the assembly is moved longitudinally towards the grip area.

[0006] In machine tools with moving assemblies within the housing, springs are frequently used to decouple the assembly from vibrations and oscillations. Relatively soft springs with relatively low axial stiffness could be used for particularly good decoupling. However, this advantageously low axial stiffness is regularly accompanied by a correspondingly low stiffness in the transverse direction, and this low transverse stiffness (relative to the longitudinal Z-axis and / or the impact axis) may not be sufficient to effectively support the weight of the assembly. As a result, the assembly can move undesirably within the housing, for example, when the machine tool is moved while not in operation. Consequently, stiffer springs may have to be used, which can lead to less effective vibration decoupling.

[0007] The invention addresses this issue by proposing a locking mechanism designed as a plug-in connection, which supports the rear Z-axis decoupling spring in a transverse direction, particularly in the vertical direction Y, but also in the transverse direction X, when the machine tool is not in operation. Specifically, the plug-in connection engages when the rear Z-axis decoupling spring pushes the assembly forward relative to the housing after the machine tool has finished operating, and this engagement provides transverse support for the rear Z-axis decoupling spring. Conversely, if the assembly is moved backward relative to the housing during operation (when a tool actuated by the impact mechanism is pressed against a surface), the plug-in connection disengages, allowing the Z-axis decoupling spring (and any other decoupling springs) to act freely for vibration isolation.

[0008] In particular, the connector comprises a coupling and a corresponding plug, wherein it is especially preferred that the coupling is arranged on the housing and that the plug is arranged on the assembly, preferably on an inner housing of the assembly. This can be advantageous with regard to the design effort and the manufacturing effort.

[0009] Furthermore, it is particularly preferred that the connector is formed by at least one rib. This can further reduce the manufacturing effort. However, other designs, for example with a pin, are also conceivable. The at least one rib can, in particular, project from the assembly, preferably from an inner housing of the assembly, and especially project towards the housing.

[0010] Another preferred embodiment of the invention consists in the plug having a V-shaped insertion rib pointing towards the coupling. Such a V-shape allows a centering function to be implemented in a particularly simple manner, thus further simplifying operation.

[0011] Advantageously, the connector can have at least one support rib that supports the insertion rib, with the insertion rib being arranged between the support rib and the coupling. This allows for particularly high robustness to be achieved in a very simple manner. The at least one support rib can, in particular, run parallel to the plug axis, which can be advantageous with regard to manufacturing effort. Specifically, it can be provided that the connector has at least three support ribs that support the insertion rib, with one of the support ribs ending centrally at the insertion rib that points towards the coupling in a V-shape, and the other two support ribs ending at the ends of the insertion rib that points towards the coupling in a V-shape. This allows for a particularly robust arrangement to be realized with very little effort.

[0012] According to a further advantageous embodiment of the invention, the coupling is formed by two plate-shaped projections, which preferably project into the interior of the housing.

[0013] Preferably, at least one of the rear Z-decoupling springs can be a helical spring. This further reduces the design complexity.

[0014] The invention is explained in more detail below with reference to preferred embodiments, which are shown schematically in the accompanying figures. Individual features of the embodiments described below can, in principle, be implemented individually or in any combination within the scope of the invention. The figures schematically show: Fig. 1 a highly simplified side sectional view of a first embodiment of a machine tool in the machine tool's rest position; Fig. 2 a partially transparent detailed side view of the machine tool according to Fig. 1 in the area of ​​the plug connection, namely with the plug connection inserted when the machine tool is at rest; Fig. 3 a partially transparent detail side view of the machine tool after Fig. 1 in the area of ​​the plug connection, analogous Figure 2 , namely with the plug connection disconnected during operation of the machine tool; Fig. 4 a perspective detail view of the inside of the housing of the machine tool in the area of ​​the coupling.

[0015] The figures show a first embodiment of a machine tool 1, which in this case is designed as a rotary hammer or combination hammer, but in an alternative embodiment can also be designed, for example, as a chisel hammer or the like.

[0016] The machine tool 1 is designed in this case as a cordless machine tool with a battery 3, but in an alternative design it can also be intended for mains operation.

[0017] The machine tool 1 is designed here in an angled configuration and has a housing 5 which features a rear, user-accessible, D-shaped grip area 7. The housing 5, which can be made of one or more parts, is shown here divided longitudinally Z and constructed in a so-called cup-shaped design. Alternatively, the housing 5 can also have, in particular, two housing halves that can be joined together in the transverse direction X and be constructed in a so-called shell-shaped design.

[0018] Within the housing 5, an assembly 9 is arranged, comprising a conventionally designed percussion mechanism 11 and a drive unit 13 designed as an electric motor, which is configured to drive the percussion mechanism 11. The assembly 9 is L-shaped in this case.

[0019] The machine tool 1, in particular its impact mechanism 11, has a tool holder 16 in a conventionally known manner, via which a tool 17, for example a chisel or the like, can be detachably connected to the impact mechanism 11. By means of the assembly 9, chisel operation is possible in this case, wherein, in chisel operation, a tool 17 held in the impact mechanism 11 is moved back and forth in an oscillating motion in the direction of an impact axis 19. In hammer drilling operation, the tool 17 additionally performs a rotary motion about the impact axis 19.

[0020] In Figure 1The diagram also shows a longitudinal direction Z, a vertical direction Y, and a transverse direction X. X, Y, and Z are axes of a Cartesian coordinate system and are mutually perpendicular. Without the application of an external force, the longitudinal direction Z coincides with the impact axis 19, which is defined by a central axis of the tool 17 held in the tool holder or of the tool holder itself.

[0021] The grip area 7 is located in a rear area of ​​the housing 5, i.e. an area which is located in the longitudinal direction Z opposite to the tool holder 16 on the machine tool 1.

[0022] The assembly 9 can have a separate inner housing 21, which in particular encloses the percussion device 11 and the drive device 13, or within which the percussion device 11 and the drive device 13 are in particular arranged almost completely or completely.

[0023] An example is a front handle area 27 or side handle, which can be detachably connected to the housing 5 in the area of ​​the front decoupling device 23, for example by means of a tension band. In this case, the front handle area 27 extends essentially in the transverse direction X, but can be arranged on the housing 5 in a way that is continuously adjustable in the circumferential direction relative to the longitudinal direction Z.

[0024] The assembly 9 is displaceable relative to the housing 5 in the longitudinal direction Z, the transverse direction X, and the vertical direction Y. For decoupled mounting of the assembly 9 on the housing 5, the machine tool has a rear Z-coupling spring 35, which is arranged between the assembly 9 and the housing 5 and which compresses when the assembly 9 is moved in the longitudinal direction Z towards the grip area 7. Furthermore, additional Z-coupling springs, parallel to the Z-coupling spring 35, as well as further decoupling springs between the housing 5 and the assembly 9, can be provided.

[0025] The machine tool has a plug connection consisting of a coupling 62 and a plug 61, wherein the plug 61 can be inserted into the coupling 62 in the direction of a plug axis 69. The plug axis 69 runs in the longitudinal direction Z, i.e., parallel to the impact axis 19. As the Figures 2 and 3As shown, the stub axle 69 can advantageously be located at the level of the impact axle 19. In the side view of the Figures 2 and 3 , i.e. when looking in the direction of the transverse axis X, the insertion axis 69 and the impact axis 19 are then identical.

[0026] The plug is located on the assembly 9, namely on its inner housing 21, in particular in the area of ​​the impact mechanism 11. The coupling 62 is located on the inside of the housing 5.

[0027] The plug 61 has an insertion rib 71 which is V-shaped, with the V-shape pointing towards the coupling. In particular, the V-shape of the insertion rib is symmetrical to the plug axis 69. The connector 61 further comprises a central support rib 72", which terminates centrally at the corner of the V-shape of the insertion rib 71. The connector also comprises two lateral support ribs 72' and 72‴, each terminating at opposite ends of the V-shape. The support ribs 72', 72", 72‴ extend rearward from the insertion rib 71, i.e., away from the coupling 62, and run parallel to the plug axis 69. The insertion rib 71 and the support ribs 72', 72", 72‴ project from the assembly 9, in particular from its inner housing 21. In the present embodiment, the insertion rib 71 and the support ribs 72', 72", 72‴ are integrally formed with the inner housing 21.

[0028] The coupling 62 has two plate-shaped projections 76', 76" which are arranged on the inside of the housing 5 and which project from the housing 5 into the interior of the housing. The projections 76', 76" form a corresponding counterpart to the plug 61, in particular to its insertion rib 71. In the present embodiment, the projections 76', 76" are integrally formed with the housing 5.

[0029] Figure 2 Figure 1 shows the machine tool 1 in a rest state in which the Z-coupling spring 35 is only weakly tensioned and therefore has little stiffness. In this state, the plug connection is inserted and provides transverse stabilization of the assembly 9 in the housing 5. Figure 3The machine tool 1 is shown in an operating state in which the tool 17 is pressed against a substrate, and consequently the Z-coupling spring 35 is further compressed, and the plug connection is disconnected. In this state, the Z-coupling spring 35 has a higher stiffness and can support the assembly even without the support of the plug connection.

Claims

1. Machine tool (1), in particular a rotary hammer or chisel hammer, comprising a housing (5) having a grip area (7), an assembly (9) comprising an impact mechanism (11) and a drive unit (13), wherein the impact mechanism (11) has an impact axis (19) defining a longitudinal direction (Z), wherein the assembly (9) is arranged at least partially within the housing (5) and is arranged to be movable relative to the housing (5) at least in the longitudinal direction (Z) and in a vertical direction (Y) perpendicular to the longitudinal direction (Z), and comprising at least one rear Z-decoupling spring (35) which is arranged between the assembly (9) and the housing (5), and which springs back when the assembly (9) is moved in the longitudinal direction (Z) towards the grip area (7), characterized by thatbetween the assembly (9) and the housing (5) at least one plug connection with a plug axis (69) extending in the longitudinal direction (Z) is provided, wherein the plug connection unplugs when the assembly (9) is moved in the longitudinal direction (Z) towards the handle area (7).

2. Machine tool according to claim 1, characterized by that The connector has a coupling (62) and a plug (61) corresponding to the coupling (62).

3. Machine tool according to claim 2, characterized by that the coupling (62) is arranged on the housing (5), and that the plug (61) is arranged on the assembly (9).

4. Machine tool according to one of claims 2 or 3, characterized by that the connector (61) is formed by at least one rib (71, 72).

5. Machine tool according to one of claims 2 to 4, characterized by that the plug (61) has a V-shaped insertion rib (71) pointing towards the coupling (62).

6. Machine tool according to claim 5, characterized by that the plug (61) has at least one support rib (72) which supports the insertion rib (71), wherein the insertion rib (71) is arranged between the support rib (72) and the coupling (62).

7. Machine tool according to claim 6, characterized by that which at least one supporting rib runs parallel to the stub axis (69).

8. Machine tool according to one of claims 6 or 7, characterized by that the plug (61) has at least three support ribs (72', 72", 72‴) which support the insertion rib (71), one of the support ribs (72') ending in the middle at the insertion rib (71) which points in a V-shape towards the coupling (62), and the other two support ribs (72', 72‴) ending at the ends of the insertion rib (71) which points in a V-shape towards the coupling (62).

9. Machine tool according to one of claims 2 to 8, characterized by thatthe coupling (62) is formed by two plate-shaped projections (76', 76").

10. Machine tool according to one of the preceding claims, characterized by that which at least one rear Z-decoupling spring (35) is a coil spring.

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